The 5621 SW IP phone is designed for organizations using the IP Office system who want a cost-effective way to enjoy the benefits of converged communications.
The 5621 SW Digital Telephone is compatible with all IP Office 403, 406v2, and 412 processors running software version 3.0.
With the 5600 series telephones, remote employees can access the full set of features while working outside the office location.They also connect to your office LAN.
These digital telephones brings superior technology directly to your desktop, delivering efficient service and superior voice quality along with cutting-edge communications features.

The EU24 Expansion Module is an optional device that extends the number of call appearances and feature buttons available on the telephone. The EU24 Expansion Module is compatible with 2420, 4621, 5420 and 5621 phones.